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igor_vitrenko [27]
3 years ago
8

The nonmetals include which of the following groups? Use the periodic table to answer the question. Check all that apply. haloge

ns alkali metals lanthanides noble gases alkaline earth metals
Physics
1 answer:
scZoUnD [109]3 years ago
3 0

Answer:

Includes halogens and noble gases

Explanation:

of 118 elements that we know, only 25 elements are non metals. This elements aren't good conductors of electric and heat. And they are weak so you can't convert them into laminas or stretch them, Halogens and noble gases are part of the non metals group, and also you have elements that belong to this group like hydrogen, carbon, sulfur, selenium, nitrogen, oxyhem and phosporus

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The Reynolds number, rho VD/mu, is a very important parameter in fluid mechanics. Verify that the Reynolds number is dimensionle
Agata [3.3K]

Answer:

Re = 1 10⁴

Explanation:

Reynolds number is

         Re = ρ v D /μ

The units of each term are

       ρ = [kg / m³]

       v = [m / s]

      D = [m]

      μ = [Pa s]

The pressure

      Pa = [N / m²] = [Kg m / s²] 1 / [m²] = [kg / m s²]

      μ = [Pa s] = [kg / m s²] [s] = [kg / m s]

We substitute the units in the equation

      Re = [kg / m³] [m / s] [m] / [kg / m s]

      Re = [kg / m s] / [m s / kg]

      RE = [ ]

Reynolds number is a scalar

Let's evaluate for the given point

Where the data for methane are:

viscosity       μ = 11.2 10⁻⁶ Pa s

the density  ρ = 0.656 kg / m³

       D = 2 in (2.54 10⁻² m / 1 in) = 5.08 10⁻² m

       Re = 0.656 4 2 5.08 10⁻² /11.2 10⁻⁶

       Re = 1.19 10⁴

4 0
3 years ago
LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. A typical LASIK laser emits a 1.
Fittoniya [83]

Answer:

143 kW

Explanation:

Given that

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Recall that Power can be mathematically calculated using the relation,

Power = Work Done / Time,

To solve this, we apply the formula

P = U / Δt

P = 2*10^-3 J / 14*10^-9 s

P = 142857 W

P = 143 kW

3 0
3 years ago
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soldi70 [24.7K]
That depends on how far it is from the nearest planet. If it's on the surface of Earth, it weighs (19 kg) x (9.8 m/s^2) = 186.2 newtons.
7 0
3 years ago
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Levart [38]

Answer:

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Explanation:

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so we can simply say

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6 0
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OLga [1]

Answer:

it can be calculated by measuring the final distance away from a point, and then subtracting the initial distance

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